Improved tool tor cutting stone



N f unina sulla parte aiya.

HUGH YOUNC, OE MIDDLETOWN, CONNECTICUT, ANDl JAMES L. YOUNG,

Y OE NEW YORK, N. Y.

Letters Patent No. 99,514, dated February 1, 1870.

IMPROVE root. Iton corran@h sToNE, am.

The Schedule referred to in these Letters-Patent and making part ot' the same.

ToaZZ whom lit may concern.-

Be itknown` that We,HUGH YONG, of Middle-A Figure 2 is a vertical section of the same through the line Z Z;

Figure 3 `represents cutters in action, showing, by dotted lines, the positions of steel points in the different cutter-blocks, and the action of the cutters upon the stone 4 Figures 4, 5, and 6, are shapes of cutters;

Figure 7 represents a bar' ot' steel; and

Figure 8, the end or; cross-section XX of the same,

to illustrate the mode of manufacture ot' our improved cutters; 4and Figures 9 and 10 are perspeotiveviews'of our improved cutters.

This invention relates to that class of tools which is used for` cutting stones, iron, and other hard substances, by means of the m nltiplied scratches of mineral-carbon points; and

Our improvements consist in replacing said mineralcarbon points by small type-like cutters `or points of chrome-steel, ferro-manganese, siliconfsteel, or other hard steels, and iu the mode of setting the same in the blocks or teeth, whereby an etiicient, accurate, durable, and cheap tool is obtained, susceptible of being applied to many wants of the arts. '/Ve will Adescribe one of our improved cutters and cutter-blocks, and .illustrate several variations 'of shape which it may assume. The block itself may be made of any approved shape tobe applied to saws, millingtools, planers, &c.; and Wel do -not claim any invention in the modeot' securing said block, having used, in our illustratiomthe shape of a wellknowirand successful one.

In the tools protected hy mineral carbon, the irreg-v ular shape and Size .of the stones, their friability, scarcity, and price, are serions objections to their general introduction in the arts.

We have taken for starting-point, in making our improvement, the procuring of a suitable substitute for minera-l carbon;. and, having accomplished that end by means of small type-like cutters of very hard steel,`we have sought the best mode of setting the same in the blocks or teeth of a tool, so as to have v the cutter supported, braced, strengthened 'bythe outter-block, and have it arranged to remove and insert new cutters in the block withlittle trouble.

A is the cutter-block or teeth, which is to be fastened vto the saw or other tool by any approved'mode.

B is the'cutter-oj: typeelike tool, made of chromesteelfferro-.man'ga'nesa silicon-steel, or any other. hard steel. f l l To make thesextypedike cutters, We employ bars of steel, iig. 7, worked to the proper cross-section, as figs.. 8,. 4, 5, and 6, and Ot' indeinite length. This Abar or bars, we saw into length, as indicated by the dotted lines, iig. 7.v These are nowset, type-likeinto a form,

and ground ou bothends, so as to obtain perfect uniformity of length, and a perfect dat end. These typelike cutters are now tempered as hard as possible, and are keptready for use,l as below described.

l Figs. 9 and 10 show two different shapes of typelike cutter. In tig. 9, there are only two cuttingpoints, V; and these cutters can only be inserted twice; butin lig. l0, there are eight cutting-points, so that', when required, this same' cutter may be used eight timcs,vby changing its position in the block A. i 'lhe block A has a hole bored from its face, c, at a vproper angle with the line of motion, M M, of the cutter-block, and of sucha depth, thatwvhen a type-like cutter is inserted therein, until it is home, the point V- ofthe cutter Will project over the top D ofthe block A. v

A small hole, e, is bored from the back part E of the block, through which a small blunt punch, P, may be used to drive ont the cutter B, when it is desired to remove it from the block, and replace it hy a new By this arrangement, we arefenabled to obtaina tool having the Ymaximum of hardness ofsteel for the cutting-point V, without any danger of said cutting point4 breaking, as it is so well stayed, braced, and strengthened, hy the surrounding block littiug closely around and against the same.

Te have not in contemplation the manufacture of circular saws, milling-tools, Sac., 'asthey are now made; but what we aim `at is to obtain a tool presenting a great many points of very hard steel, having only a small cutting-point, V, exposed, so as to cut by multiplied scratches made by these small points V, and to obtain a cheapand manageable manner of keeping such a tool in order, by replacing, cutting-points V.

The working of the cutters is illustrated in fig. 3,

at any time, the

and the mode of keeping our tool in' order isobtained HUGH YOUNG. [It S. JAMES L. YOUNG. [In s.-

Witnesses: if

JON. BELL, i H. GENGEMBnEjHUBERT. 

